Induction motors have existed for many years but were always limited in their application because the supply needed for variable speed control could only be provided by rotary converters, otherwise a three-phase fixed supply could be used to give a fixed-speed control. For this reason induction motors have been used in industrial installations for some time but their use for traction systems has only recently gained widespread acceptance with the advent of cheaper, higher ratings of static inverters and cheaper microprocessors with enough processing power to handle the control. It is assumed in this paper that other authors will explain the details of induction motor operation and power electronic inverters; only the aspects relevant to controlling induction motors will be dealt with here. Besides the introduction the paper is divided in six further sections. Section 2 deals with characteristics of the inverter-fed induction motor. Section 3 shows the scalar control operating over two distinct regions of the motor characteristic: constant flux and constant voltage. Section 4 explains the vector control firstly in an overview and secondly in a more detailed approach for those with a more detailed engineering interest. Central topics are generalised machine analysis, conversions between axes, generalised rotating reference frame, rotor flux orientation and an implementation of a control scheme with a two-axis model. Section 5 discusses other factors affecting induction motor control in traction applications and section 6 analysis future trends to overcome the problem of controlling a non-linear system, which the induction motor is, and to achieve better overall control for the whole speed range whilst simplifying the calculations.
Control of induction motors
2002
9 Seiten, 12 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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